| CPC B23C 5/02 (2013.01) [B23C 5/205 (2013.01); B23C 2200/28 (2013.01)] | 7 Claims |
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1. A double-sided cutting insert comprising an upper surface, a lower surface, a side surface, a cutting edge, and a mounting hole penetrating the upper surface and the lower surface, wherein
the upper surface is provided with a single upper surface boss portion that surrounds the mounting hole and is flat,
the cutting edge includes a main cutting edge, a corner cutting edge extending from the main cutting edge, a sub-cutting edge extending from the corner cutting edge, and a side portion extending from the sub-cutting edge,
a first main cutting edge flank surface extending from the main cutting edge forms an acute angle with an extension line of the upper surface boss portion,
a sub-cutting edge chip breaker surface extending from the sub-cutting edge is at a gradually increasing angle with the extension line of the upper surface boss portion, as the sub-cutting edge chip breaker surface is distanced away from the corner cutting edge, and
when the cutting insert is viewed into the upper surface, a side portion surface extending from the side portion is concavely recessed.
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